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Sections 503A and 503B of the FD&C Act require compounded drug products to satisfy several conditions to qualify for the statutory exemptions listed under each section. Both sections 503A and 503B contain conditions that concern whether the compounded drug product is one that the Agency has identified as presenting demonstrable difficulties for compounding. FDA is proposing to establish the criteria by which drug products and categories of drug products will be evaluated for inclusion on the Difficult to Compound List for section 503A and the Difficult to Compound List for section 503B. Based on the results of its evaluation of nominated categories of drug products to date, as well as consultation with the Pharmacy Compounding Advisory Committee (PCAC), FDA is also proposing to include certain categories of drug products on these lists.